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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d6323616f8d2c21212948fcfaa3ae06409f517745afbb6fca70471a55f0d58' 
  AND token = 'Tfh2xOA6Fv1s/pX1p0CyWow4X1bYMWG+2sKdzwQ2oDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}